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OpenStudy (anonymous):
The measured weights of 1,000 men in a certain village follow a normal distribution with a mean of 150 pounds and a standard deviation of 15 pounds. Which sentence most closely summarizes the data? About 160 people weigh more than 165 pounds. About 320 people weigh more than 165 pounds. About 320 people weigh less than 165 pounds. About 640 people weigh less than 165 pounds. Done
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OpenStudy (anonymous):
@Arnab09
OpenStudy (anonymous):
about 320 people weigh more?
OpenStudy (perl):
165 pounds is 1 standard deviation greater than 150 pounds. so it has a z score of 1. so on the standard normal distribution, what is the area to the right of z = 1 ? |dw:1366252037459:dw|
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